docs: def _get_site_amplification_term(self, C, vs30):
          """
          Returns the site amplification term on the basis of Eurocode 8
          site class
          """
          s_b, s_c, s_d = self._get_site_dummy_variables(vs30)
          return (C["sB"] * s_b) + (C["sC"] * s_c) + (C["sD"] * s_d)